diff options
| -rw-r--r-- | src/mesa/main/framebuffer.c | 123 | ||||
| -rw-r--r-- | src/mesa/main/framebuffer.h | 9 |
2 files changed, 130 insertions, 2 deletions
diff --git a/src/mesa/main/framebuffer.c b/src/mesa/main/framebuffer.c index 17241cfcef..26e72da3f7 100644 --- a/src/mesa/main/framebuffer.c +++ b/src/mesa/main/framebuffer.c @@ -2,7 +2,7 @@ * Mesa 3-D graphics library * Version: 6.5 * - * Copyright (C) 1999-2005 Brian Paul All Rights Reserved. + * Copyright (C) 1999-2006 Brian Paul All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), @@ -550,3 +550,124 @@ _mesa_update_framebuffer(GLcontext *ctx) compute_depth_max(fb); } + + +/** + * Check if the renderbuffer for a read operation (glReadPixels, glCopyPixels, + * glCopyTex[Sub]Image, etc. exists. + * \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA, + * GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL. + * \return GL_TRUE if buffer exists, GL_FALSE otherwise + */ +GLboolean +_mesa_source_buffer_exists(GLcontext *ctx, GLenum format) +{ + const struct gl_renderbuffer_attachment *att + = ctx->ReadBuffer->Attachment; + + if (ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) { + return GL_FALSE; + } + + switch (format) { + case GL_COLOR: + case GL_ALPHA: + case GL_LUMINANCE: + case GL_LUMINANCE_ALPHA: + case GL_INTENSITY: + case GL_RGB: + case GL_RGBA: + case GL_COLOR_INDEX: + if (ctx->ReadBuffer->_ColorReadBuffer == NULL) { + return GL_FALSE; + } + break; + case GL_DEPTH: + case GL_DEPTH_COMPONENT: + if (!att[BUFFER_DEPTH].Renderbuffer) { + return GL_FALSE; + } + ASSERT(att[BUFFER_DEPTH].Renderbuffer->DepthBits > 0); + break; + case GL_STENCIL: + case GL_STENCIL_INDEX: + if (!att[BUFFER_STENCIL].Renderbuffer) { + return GL_FALSE; + } + ASSERT(att[BUFFER_STENCIL].Renderbuffer->StencilBits > 0); + break; + case GL_DEPTH_STENCIL_EXT: + if (!att[BUFFER_DEPTH].Renderbuffer || + !att[BUFFER_STENCIL].Renderbuffer) { + return GL_FALSE; + } + ASSERT(att[BUFFER_DEPTH].Renderbuffer->DepthBits > 0); + ASSERT(att[BUFFER_STENCIL].Renderbuffer->StencilBits > 0); + break; + default: + _mesa_problem(ctx, + "Unexpected format 0x%x in _mesa_source_buffer_exists"); + return GL_FALSE; + } + + /* OK */ + return GL_TRUE; +} + + +/** + * As above, but for drawing operations. + * XXX code do some code merging w/ above function. + */ +GLboolean +_mesa_dest_buffer_exists(GLcontext *ctx, GLenum format) +{ + const struct gl_renderbuffer_attachment *att + = ctx->ReadBuffer->Attachment; + + if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) { + return GL_FALSE; + } + + switch (format) { + case GL_COLOR: + case GL_ALPHA: + case GL_LUMINANCE: + case GL_LUMINANCE_ALPHA: + case GL_INTENSITY: + case GL_RGB: + case GL_RGBA: + case GL_COLOR_INDEX: + /* nothing special */ + break; + case GL_DEPTH: + case GL_DEPTH_COMPONENT: + if (!att[BUFFER_DEPTH].Renderbuffer) { + return GL_FALSE; + } + ASSERT(att[BUFFER_DEPTH].Renderbuffer->DepthBits > 0); + break; + case GL_STENCIL: + case GL_STENCIL_INDEX: + if (!att[BUFFER_STENCIL].Renderbuffer) { + return GL_FALSE; + } + ASSERT(att[BUFFER_STENCIL].Renderbuffer->StencilBits > 0); + break; + case GL_DEPTH_STENCIL_EXT: + if (!att[BUFFER_DEPTH].Renderbuffer || + !att[BUFFER_STENCIL].Renderbuffer) { + return GL_FALSE; + } + ASSERT(att[BUFFER_DEPTH].Renderbuffer->DepthBits > 0); + ASSERT(att[BUFFER_STENCIL].Renderbuffer->StencilBits > 0); + break; + default: + _mesa_problem(ctx, + "Unexpected format 0x%x in _mesa_source_buffer_exists"); + return GL_FALSE; + } + + /* OK */ + return GL_TRUE; +} diff --git a/src/mesa/main/framebuffer.h b/src/mesa/main/framebuffer.h index fcc493c193..51847b07c0 100644 --- a/src/mesa/main/framebuffer.h +++ b/src/mesa/main/framebuffer.h @@ -2,7 +2,7 @@ * Mesa 3-D graphics library * Version: 6.5 * - * Copyright (C) 1999-2005 Brian Paul All Rights Reserved. + * Copyright (C) 1999-2006 Brian Paul All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), @@ -55,4 +55,11 @@ _mesa_update_framebuffer_visual(struct gl_framebuffer *fb); extern void _mesa_update_framebuffer(GLcontext *ctx); +extern GLboolean +_mesa_source_buffer_exists(GLcontext *ctx, GLenum format); + +extern GLboolean +_mesa_dest_buffer_exists(GLcontext *ctx, GLenum format); + + #endif /* FRAMEBUFFER_H */ |